Attachment for sewing-machines.



PATBNTED JUNE 28, 1904.

. G. I. GREEN. ATTACHMENT FOR SEWING MACHINES.

APPLIGA'I'IOK FILED HOV. 9, 1903.

R0 MODEL.

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UNITED STATES Patented June 28, 1904.

PATENT OFFICE.

GEORGE I. GREEN, OF SAN FRANCISCO, CALIFORNIA.

ATTACHMENT FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 763,880, dated June 28, 1904.

Application filed November 9, 1903. Serial No, 180,461. (No model.)

To all whom it may concern:

Be it known that I, GEORGE I. GREEN, a citizen of the United States, residing at 1441 OFarrell street, in the city of San Francisco, county of San Francisco, and State of California, have invented certain new and useful Improvements in Attachments for Sewing-Machines; and I do hereby declare the following to be a full, clear, and exact description of the said invention, such as will enable others skilled in the art to which it most nearly appertains to make, use, and practice the same.

This invention relates to improvements in sewing-machines, and particularly to an abrasive wheel attached to the bobbin-winding mechanism thereof.

The object of this invention is to provide a means for sharpening scissors, needles, and other edged instruments used about a sewingmachine.

Broadly, the invention consists of a small abrasive wheel attached to the spindle of the bobbin-winding mechanism and provided with an adjustable graduated guide adapted to guide the blade to be sharpened and determine the bevel of the edge thereof and an encircling guard to prevent dissemination of grit and oil when the mechanism is in use.

In the drawings, Figure 1 is a side elevation of a portion of a sewing-machinebody, showing the bobbin-winding 'mechamsm having this invention applied thereto. Fig. 2 is a plan view from above of the same. Fig. 3 is an end elevation of the same. Fig. this a detail of the shaft of the bobbin-holder, having an abrasive wheel fixed thereon in accordance with this invention.

In detail the construction consists of the usual bobbin-winding mechanism, consisting generally of the bracket A, pivoted to" the machine-body and carrying the pulley A engaging the belt or hand wheel of the machine to rotate the bobbin B. The abrasive wheel O, of carborundum, emery, or such material, is fixed on the stem D of the spindleD by means of the bushing D screwed onto the stem and jammed by the nut D forced against the washer D. The spindle D is journaled in the counterbored lug A within which the spiral spring A is interposed to allow for retracting the spindle to insert the bobbin. With the bobbin inserted the rotation of the pulley A is imparted through the bobbin to the spindle D and the abrasive wheel. To insure against slipping, a special b'obbin provided with the lugs B, fitting into the recesses filed in the heads of the bobbin-holders, may be provided Where required.

The graduated guide E consists of an integral piece of sheet metal angularly bent to inclose the abrasive wheel. The sides E of the guide "extend at an angle downward across the edges of the wheel and are pivoted to the clamp engaging the lug A This clamp consists of the metal strap F, looped over the lug A and screwed at F to the bar F extending under the lug A The ends F F of the strap are bent up and threaded to receive the screws E upon which the guide E is pivoted. One side, E, of the guide is provided with the concentric slot E, through which the set-screw E threaded in the bar F extends. This allows for adjustment of the angle of the guide with respect to the face of the emery-wheel, the angle being indicated by graduations E and the indicator F on the end F To prevent dissemination of the grit and oil thrown ofi'by the wheel, the guard-ring G, of sheet metal, is sprung onto the guide, so as to inclose the wheel. The guard-ring is notched at G to allow the blade X to bear against the wheel.

The bobbin-winding mechanisms of the various makes of sewing-machines are similar in the principal mechanisms; but certain minor differences in construction will require accommodating changes in the application of this invention thereto. The invention has been -illustrated and described in its application to a general form of bobbin-winder; but obviously various structural changes could be made without departing from the spirit of the invention.

Having thus described this invention, what is claimed, and desired to be'secured by Letters Patent, is a 1. An attachment for sewing-machines comprising a spindle-supporting bracket, an abrasive wheel supported therein, a clamp embracing said bracket, an adjustable guide having its sides extended at an angle across the edges of said Wheel, means for pivotally uniting said sides to said clamp, one of said sides having a guiding-slot, and a guide-screw secured to said clamp and working in said slot.

2. An attachment for sewing-machines comprising a spindle-su 'morting bracket, an abrasive wheel supported therein, a two part clamp embracing said bracket, screws uniting the parts of said clamp, an adjustable guide pivotally mounted on said clamp uniting screws, and means for holding said bracket in any adjusted position.

3. An attachment for sewing-machines comprising a spindle-supporting bracket, an abrasive wheel mounted therein, a two part clamp embracing said bracket, screws uniting the parts of said clamp, an adjustable guide pivotally mounted on said clamp uniting screws, one side of said guide having a slot formed therein, and a guide-screw extended through said slot and engaging said clamp.

4. An attachment for sewing-machines comprising a spindle-supporting bracket, an abraiat 763,880

sive wheel mounted therein, a clamp embracing said bracket, an adjustable guide having its sides extended at an angle across the edges of said wheel, one of said sides being provided with a guiding-slot, means for pivotally mounting said guide upon said clamp, a guide-screw secured to said clamp and extended through said slot, and a guard encircling said wheel and embracing said guide.

5. An attachment for sewing-machines comprising a spindle-supporting bracket, an abrasive wheel mounted therein, a two-part clamp embracing said bracket, screws uniting the parts of said clamp, an adjustable guide pivotally mounted on said clamp-uniting screws, means for holding said bracket in any adjusted position, and a notched guard encircling said wheel.

In testimony whereof I have hereunto set my hand this 31st day of October, 1903.

GEORGE I. GREEN. Witnesses:

BALDWIN VALE, F. E. Bruce. 

